Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-20743-0
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Funding
- National Natural Science Foundation of China [41676112]
- National Basic Research Program (973 Program) of China [2015CB954002]
- Program for Changjiang Scholars
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Distribution of diazotrophs and their nitrogen fixation activity were investigated in the northern South China Sea (nSCS) and the Kuroshio from July 16th to September 1st, 2009. N-2 fixation activities in whole seawater and <10 mu m fraction at the surface were measured by acetylene reduction assay. Higher activities were observed at the East China Sea (ECS) Kuroshio and the nSCS shelf. The nSCS basin showed a low N-2 fixation activity. The <10 mu m fractions (unicellular diazotrophs) contributed major portion to the whole-water activity in the survey time, indicating that nanoplanktonic cyanobacterias were the major diazotrophs in the survey area. Daily N-2 fixation rates of Trichodesmium ranged from 0.11 to 9.83 pmolNtrichome(-1) d(-1) with an average of 4.03 pmolNtrichome(-1) d(-1). The Luzon Strait and the ECS Kuroshio had higher N-2 fixation rates of Trichodesmium than the nSCS shelf and basin. Calculated activities of Trichodesmium at most stations were moderately low compared with that of the whole-water. The contribution of N-2 fixation by the whole-water to primary production ranged from 1.7% to 18.5%. The estimated amount of new nitrogen introduced by Trichodesmium contributed up to 0.14% of the total primary production and 0.41% of the new production in the Luzon Strait.
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